NEW YORK — Sheldon Silver, a corrupt Manhattan politician who for most of his 21 years as state Assembly speaker took money from real estate developers and people sickened by a deadly disease, died Monday at age 77. Silver died at federal prison medical facility in Ayer, Massachusetts, his former chief of staff Judy Rapfogel told the New York Daily News. “I will say that Shelly Silver did a lot of good things,” Rapfogel said. Taciturn in public, Silver was known in Albany as an able negotiator for Assembly Democrats on the state budget and numerous other issues. Among his accomplishments was h…